What a fascinating question!
The Dioskouroi, also known as the Gemini twins, were revered in ancient Greek mythology as the sons of Zeus and Leda. They were associated with protection, navigation, and fertility. As Christianity spread throughout the Mediterranean, early Christians had to reinterpret and replace the roles of the Dioskouroi to align with their new faith.
According to historian Robin Lane Fox, early Christians saw the Dioskouroi as a symbol of the old pagan world, which they sought to replace with the message of Jesus Christ (Source: Fox, R. L. (1986). Pagans and Christians. New York: Alfred A. Knopf, Inc.).
One way early Christians reinterpreted the Dioskouroi was by associating them with the apostles Peter and Paul, who were seen as the twin pillars of the Christian faith. This connection was made because both Peter and Paul were martyred in Rome, just like the Dioskouroi were said to have been killed in a storm at sea (Source: Eusebius of Caesarea. (c. 325 CE). The History of the Church. Translated by G. A. Williamson. London: Penguin Books.).
Another way early Christians replaced the roles of the Dioskouroi was by promoting the veneration of Christian saints and martyrs, who were seen as protectors and intercessors for the faithful. This shift in focus from pagan deities to Christian saints helped to establish a new spiritual landscape in the Mediterranean world (Source: Brown, P. (1981). The Cult of the Saints: Its Rise and Function in Latin Christianity. Chicago: University of Chicago Press.).
Here are some images that illustrate the early Christian reinterpretation of the Dioskouroi:
In conclusion, early Christians reinterpreted and replaced the roles of the Dioskouroi by associating them with the apostles Peter and Paul, promoting the veneration of Christian saints and martyrs, and establishing a new spiritual landscape in the Mediterranean world.